Analysis of the effect of microscopic bubble collapse on the decomposition of Cr-EDTA heavy metal complexes

Industrial organic wastewater contains heavy metal ions, which are toxic, difficult to degrade, and easily accumulates in the environment. Moreover, these ions easily form a high-steady-state struc - ture with organic complexes, thus increasing the difficulty of degradation. The mechanical and chemical effects caused by bubble collapse can effectively decompose heavy metal complexes, but its specific influence law remains unclear. This study aims to determine the relationship between the factors affecting the collapse of free state bubble and the decomplexing effect of heavy metal complexes by establishing various complex models and considering the local density of each atom in the complex as the research object. The radial distribution function of atoms was used to char - acterize the changes in the structure of heavy metal complexes, and the effects of bubble radius ( R ), compressive strain (ε), and temperature ( T ) on the decomplexing of heavy metal complexes were compared and analyzed. The results show that compressive strain and temperature have obvi - ous effects in the initial stage of bubble collapse. At the same bubble radius, the compressive strain has the greatest influence on the effect of decomplexation, followed by the temperature influence. At 2,000 fs, the number of carbon atoms around the carbon atoms decreased by 40%. When the compressive strain is 0.001, the bubble radius is 20 Å, and the temperature is 308 K, the effect of decomplexation is the best. With the increase in compressive strain, the bubble radius and tem - perature enhanced the acceleration of the collapse of the bubble and energy release for decom - plexation treatment. The theory can provide technical guidance for engineering applications and is of great significance for accelerating the progress of sewage treatment technology.